Of course, upgrades can (and at some point should) be made if you enjoy playing the deck
4 Strategy, Schmategy Sure, you could spend your time meticulously crafting a Magic deck, spending hundreds of hours and dollars to create an intricate masterpiece, but that's boring
If either face has a color indicator or basic land type, those are also considered.
Elspeth, Storm Slayer Elspeth, Storm Slayer is a versatile 5-mana planeswalker that can make tokens, double the tokens created (Anointed Procession comes to mind), and even remove a threat
You could also pair this black enchantment with cards like Young Pyromancer and Third Path Iconoclast that produce tokens when you cast spells
Enchantment Mystic Remora Cumulative upkeep (At the beginning of your upkeep, put an age counter on this permanent, then sacrifice it unless you pay its upkeep cost for each age counter on it.) Whenever an opponent casts a noncreature spell, you may draw a card unless that player pays